CVE-2020-36406

HIGH 8.8CVE-2020-36406 · Published 01/07/2021 · updated 17/06/2026

In short

CVE-2020-36406 is a HIGH (CVSS 8.8) vulnerability affecting uwebsockets (uwebsockets project).
Chance of exploitation in the next 30 days (EPSS): 1.5%, higher than 74.8% of all vulnerabilities.
No patched version is listed yet: follow the vendor's advisory in References.

Package	Affected versions	Patched versions
uwebsockets uwebsockets_project	`= 18.11.0= 18.12.0`	No fix yet

Description

uWebSockets 18.11.0 and 18.12.0 has a stack-based buffer overflow in uWS::TopicTree::trimTree (called from uWS::TopicTree::unsubscribeAll). NOTE: the vendor's position is that this is "a minor issue or not even an issue at all" because the developer of an application (that uses uWebSockets) should not be allowing the large number of triggered topics to accumulate

References

bugs.chromium.org/p/oss-fuzz/issues/detail · Exploit
google/oss-fuzz-vulns · Third Party Advisory
uNetworking/uWebSockets commit 03fca62 · Patch

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